/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package walrus.unpack.xml;

import java.io.File;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

import walrus.base.ArticleBuffer;

public class QueuingArticleLoader extends ArticleLoader {

	private static final int BUFFER_CAPACITY = 10;
	private final BlockingQueue<ArticleBuffer> in;
	private final BlockingQueue<ArticleBuffer> out;
	
	public QueuingArticleLoader(File target) {
		this(target, new ArrayBlockingQueue<ArticleBuffer>(BUFFER_CAPACITY));
	}
	
	public QueuingArticleLoader(File target, BlockingQueue<ArticleBuffer> in,
			BlockingQueue<ArticleBuffer> out) {
		super(target);
		this.in = in;
		this.out = out;
	}

	public QueuingArticleLoader(File target,
			BlockingQueue<ArticleBuffer> queue) {
		this(target, queue, queue);
		for (int i=1;i<BUFFER_CAPACITY;i++) {
			in.add(new ArticleBuffer());
		}
	}

	@Override
	protected void endText() {
		final ArticleBuffer buffer = retireBuffer();
		try {
			out.put(buffer);
		} catch (InterruptedException e) {
			e.printStackTrace();
			endText();
		}
	}

	@Override
	protected ArticleBuffer next() {
		try {
			final ArticleBuffer result = in.take();
			return result;
		} catch (InterruptedException e) {
			e.printStackTrace();
			return next();
		}
	}
}
